Milk pttstp



Jp. 21,1931. J.P;HAN'SEN 1,790,470

MILK PUMP Filed April 9, 1928 Patented Jan., 27.1931

UNITED STATES PATENT oEFlcE Juas P. HANSEN, or xENosHA, wrscoNsIN, AssIGNoB, To 'rm criovaiil MACHINE co., v or xENosHA, wIscoNsIN L p MILK -v Application mea pnl s,

lcontain a lubricant without any chance of the lubricants "arriving at the milk. chamber which, as stated, is a separate entity.

Further objects are to provide a milk pumpwhich isso constructed that it will not break up the fat particles ofthe milk, and which is sanitary and may be easily separated into its component parts, and which further is so constructed that the grease in the milk acts as a lubricantfor ,the'pum l An embodiment of theinventlon is shown in the accompanying drawings in which:

Figure 1 is a longitudinal sectional view through the pump, such view. corresponding to a section on the line 1-1 of Figure 2.

Figure 2 is vagfront view of the pump with parts broken awa and in' section.

Referrin t`o the drawings, it will be seen that the m1lk pump is carried by asuitable support 1 which is provided with av hollow A -projecting bearing portion 2. This bearing portion is provided with removable vcaps 3 at its ends and the driving shaft 4 projects completely through the bearing portion,

This driving shaft is provided withl a pair of inner raceways 5 which cooperate with the roller bearings 6 and with outer raceways 7 carried within the bearing support 2. Preferably the inner raceways 5 are held spaced by means of a collar 8 pinned to the shaft, as shown in Figure 1. It is also preferable to provide the rollers 6 with heads 9 which have 4conical .faces fitting within a correspondingly shapedpair of grooves formed in the inner raceways and cooperating with a conical inner edge formed on the outer raceways to thus definitely position the shaft.

The support 1 also carries an upwardlyextending plate 10 vwhich is apertured to receive `the internally threaded lugs 11 of the is also provided with an inlet19. It is proprovided with the bevel faces 25. For extion 28 Which forms with the larger portion PUMP 1928.` Serial No. 268,686.

pump chamber 12. These lugs recevebkolts '13 which are adapted to draw the pac ing gland 14 against the packing 15 surrounding f the shaft. It is to be noted that the packing 415 is spaced a material distance rearwardly of the elongated bearing 16 for the shaft.

The front of the pump chamber is open and Iis closed by means of a -face plate 17 provided with abulged hollow portion 18. It

vided with a shouldered portion 20' which conforms to the inner `cylindrical surface of the pump casing 12 and thus centers the plate. The plate is heldin place by means of a plurality of regularly spaced pivotally mounted bolts 21 provided with wing nuts 22. The plate is provided with slotted lugs or ears 23 into the slots of which the bolts 21 may I.

be swung. 'f

The pump casing is provided with an outlet pipeor extension 24. Boththe outlet pipe andthe inletl pipe orextension 24and 19 respectively, are provided .with threads adapted to receive fittings. Further, they are ample, as shown in Figure 2, the fitting cooperating'with these members may consist of unions indicated by' the reference character' i 26 which is the movable nut portion thereof and a pipe member; 27 held by the union in SQ contact with t-he bevel faces. The inner ends of the pipe section 27 are similarly bevelled.v i

The shaft 4 isprovided with a reduced pora shoulder 29. A rotor is'c'arried within the' 85 pump casing 12 andfis provided with a hub portion 3() apertured to receive the reducedextension 28 of the shaft and locked in place' by means of a nut 31 threaded upon the end 9c of the shaft. The nut 31 is received within the hollow projection 18 of the faceplate or 17. It is of suiicient width to prevent the 100 enters the inlet portion 19 and is caught by the impellers and moved rearwardly While at the same time, the milk is spun by'thc rotating impeller and passes out of the tangentially arranged outlet portion without any' shock whatsoever to the milk. The action of the pump differs from a centrifugal pump as the milk is not thrown radially outwardly, but as it is thrown rearwardly and graduall moved outwardly without being subjecte to any sudden shock.

The tests conducted with this pump have demonstrated very clearly; that there is no churning of the milk nor reaking up of the fat particles, and that there is no foaming produced, as in the ordinary types of pumps.

Further, it will be noted that there is no possibility of the leaking of the lubricant into the milk chamber as the main lubricated bearing for the shaft is an entirely distinct and separate entity from the pump casing.

Further, it is to be noted that t e pump is very readily separated into its component parts for cleaning. For example, the face plate may be readily removed and, if desired, the entire pump casing may be readily taken from the apparatus. All that is necessary in this case is to loosen the bolts 13 and the nut 31 (see Figure 1). This permits the entire removal of the pump casing and the impeller so that they-may be readily sterilized.

It will be seen that a novel type of milk pump has been provided which depends for its action upon the operation of a screw impeller, which moves the milk rearwardly and outgardly Without any violent shock to the mil It will be seen further that the ap aratus is so constructed that the parts'may sterilized with the utmost ease. 4

Further than this, it is to be particularly noted that the construction of the pump casing is such that it may yieldingly adjust itself upon the shaft and upon its support 10 (see Figure 1) so that there can be no metal to metal binding of the parts. The ump casing may freely shift to a slight egree upon the shaft to thus accurately, adjust the rotor or impeller.

Although the invention has been described in considerable detail, such description is intended' as illustrative rather than limiting as 'y the invention may-be variously embodied and as the scope of suchinvention is to determined as. claimed.

I claim:

A'milk pump comprising a main support having a hollow bearing portion rising therefrom, a shaft extending through the bearing portion, inner land outer raceways within the bearing portion and surrounding the shaft, roller bearings disposed within said raceways, a. collar nned to the shaft and arranged between t e inner portions of the raceways for revolubly supporting said shaft and retaining the same against axial movement, a plate extending laterally from the support and formed with spaced apertures, a pump casing having lugs passing into said apertures and having a floating support with reference to sa'rd plate, an impeller carried by said shaft and positioned within said pump casing, a removable face plate having lugs formed with slots, movable bolts carried by the casing and-adapted to engage with said slots, winged nuts carried by the bolts and adapted to be tightened against the lugs and said face plate being in approximate contact with the outer face of the impeller.

' In testimony that I claim the foregoing I have hereunto set my hand at Kenosha, in the county of Kenosha and State of Wisconsin. l

JAMES P. HANSEN. 

